Kirisun DP480, Service Manual

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DP480 Service Manual
10
⚫ Digital AGC
⚫ Modulation and demodulation technique based on digital signal processing technology
d. TX path of direct frequency synthesis
⚫
Modulation method of direct frequency synthesis
⚫ TX filter based on digital signal processing technology
⚫ TX modulation gain number is adjustable
⚫ Digital voice activates TX control
e. High-performance fractional PLL frequency synthesizer
⚫ Fully-integrated in-chip RF VCO
⚫ Fully-integrated internal loop filter
⚫ Low phase noise
⚫ Fast lock of phase
⚫ High-frequency resolution with random frequency adjustable
⚫
Built-in transistor frequency error calibration circuit
f. Sleep mode of ultra-low loss
g. Three wire serial digital interface control
4.7.2.
Port Description of AT1846S
AVDD 1 Power supply
SCLK 2 Clock input for serial control bus
SDIO 3 Data input/output for serial control bus
AVDD 4 Power supply
XTAL1 5 Oscillator pin 1
XTAL2 6 Oscillator pin 2,control interface select
MODE 7
When MODE = VL, I2C Interface is select; When MODE = VH, SPI Interface is
select
SENB 8 Latch enable (active low) input for serial control bus
AFOUT 9 Audio signal output to speaker
NC* 10 No connection